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https://github.com/upx/upx
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c26ef87202
Added Files: p_lx_interp.cpp stub/l_lx_pti.c stub/fold_pti86.asm stub/fold_pti86.h stub/l_lx_pti86.asm stub/l_lx_pti86.h stub/l_lx_pti86.lds committer: jreiser <jreiser> 1108855010 +0000
120 lines
3.4 KiB
NASM
120 lines
3.4 KiB
NASM
; fold_pti86.asm -- linkage to C code to act as ELF PT_INTERP
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;
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; This file is part of the UPX executable compressor.
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;
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; Copyright (C) 2000-2004 John F. Reiser
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; All Rights Reserved.
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;
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; UPX and the UCL library are free software; you can redistribute them
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; and/or modify them under the terms of the GNU General Public License as
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; published by the Free Software Foundation; either version 2 of
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; the License, or (at your option) any later version.
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;
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; This program is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with this program; see the file COPYING.
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; If not, write to the Free Software Foundation, Inc.,
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; 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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;
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; Markus F.X.J. Oberhumer Laszlo Molnar
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; <mfx@users.sourceforge.net> <ml1050@users.sourceforge.net>
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;
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; John F. Reiser
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; <jreiser@users.sourceforge.net>
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;
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BITS 32
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SECTION .text
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CPU 386
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%define PAGE_SIZE ( 1<<12)
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%define AT_NULL 0
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%define AT_PHDR 3
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%define szElf32_Ehdr 0x34
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%define szElf32_Phdr 8*4
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%define e_entry (16 + 2*2 + 4)
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%define p_vaddr 2*4
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%define p_memsz 5*4
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%define szb_info 12
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%define szl_info 12
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%define szp_info 12
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%define a_type 0
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%define a_val 4
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%define sz_auxv 8
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%define MAP_FIXED 0x10
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%define MAP_PRIVATE 0x02
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%define MAP_ANONYMOUS 0x20
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%define PROT_READ 1
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%define PROT_WRITE 2
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%define PROT_EXEC 4
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%define __NR_mmap 90
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%define __NR_munmap 91
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%define OVERHEAD 2048
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%define MAX_ELF_HDR 512
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pop ebp ; get_fexp
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pop ecx ; get_funf
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pop eax ; argc
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lea edi, [4+ 4*eax + esp] ; &environ
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push eax ; argc
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sub eax,eax ; 0
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L310:
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scasd
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jne L310
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scasd ; edi= &Elf32_auxv_t
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mov esi,edi
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L320:
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mov eax,[esi] ; a_type
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cmp eax, byte AT_PHDR
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je L330
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add esi, byte sz_auxv
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cmp eax, byte AT_NULL
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jne L320
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L330:
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mov ebx,[a_val + esi]
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push ebx ; save &Elf32_Phdr of compressed data
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sub esp, dword MAX_ELF_HDR + OVERHEAD ; working storage
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mov edx, esp
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push ecx ; get_funf 9th param to pti_main
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lea eax, [2*szElf32_Phdr + szl_info + szp_info + ebx] ; 1st &b_info
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mov esi, [e_entry + ebx] ; beyond compressed data
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sub esi, eax ; length of compressed data
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mov ebx, [ eax] ; length of uncompressed ELF headers
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mov ecx, [4+ eax] ; length of compressed ELF headers
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add ecx, byte szb_info
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pusha ; (AT_table, sz_cpr, get_fexp, &tmp_ehdr, {sz_unc, &tmp}, {sz_cpr, &b1st_info} )
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EXTERN pti_main
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call pti_main ; returns entry address
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add esp, dword 9*4 + MAX_ELF_HDR + OVERHEAD ; remove 9 params, temp space
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pop ebx ; &Elf32_Phdr
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push eax ; save entry address
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mov ecx,[p_memsz + ebx]
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mov ebx,[p_vaddr + ebx]
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mov eax,__NR_munmap
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int 0x80 ; unmap compressed data
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sub eax,eax
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sub ecx,ecx
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sub edx,edx
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sub ebx,ebx
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sub ebp,ebp
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sub esi,esi
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sub edi,edi
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ret ; goto entry point
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; vi:ts=8:et:nowrap
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